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RPM Calculator
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Popular Transmission Ratios - use for input below
TRANSMISSION
1ST
2ND
3RD
4TH
5TH
GM Muncie (M20) 66-74
2.52
1.88
1.46
1.00
n/a
GM Muncie (M20) 63-65
2.56
1.91
1.48
1.00
n/a
GM Muncie (M21/M22)
2.20
1.64
1.28
1.00
n/a
GM Powerglide
1.76
1.00
n/a
n/a
n/a
GM Turbo Hydra-Matic 350
2.52
1.52
1.00
n/a
n/a
GM Turbo Hydra-Matic 400/4L80E
2.48
1.48
1.00
0.78
n/a
GM Turbo Hydra-Matic 2004R
2.74
1.57
1.00
0.67
n/a
GM Turbo Hydra-Matic 700-R4/4L60E
3.06
1.63
1.00
0.70
n/a
Tremec 3550/TKO
3.27
1.98
1.34
1.00
0.68
Input
- Note: Currently set for my personal trans (TH350) and rear tire combination.
1st gear ratio:
3rd gear ratio:
5th gear ratio:
2nd gear ratio:
4th gear ratio:
6th gear ratio:
Tire:
155
165
175
185
195
205
215
225
235
245
255
265
275
285
295
305
315
325
335
x
30
35
40
45
50
55
60
65
70
75
80
x
12
13
14
15
16
17
18
19
Rear axle ratio:
Speed (mph):
1st gear RPM is:
3rd gear RPM is:
5th gear RPM is:
2nd gear RPM is:
4th gear RPM is:
6th gear RPM is:
Input
- Second set for comparison using 700R4 specs
1st gear ratio:
3rd gear ratio:
5th gear ratio:
2nd gear ratio:
4th gear ratio:
6th gear ratio:
Tire:
155
165
175
185
195
205
215
225
235
245
255
265
275
285
295
305
315
325
335
x
30
35
40
45
50
55
60
65
70
75
80
x
12
13
14
15
16
17
18
19
Rear axle ratio:
Speed (mph):
1st gear RPM is:
3rd gear RPM is:
5th gear RPM is:
2nd gear RPM is:
4th gear RPM is:
6th gear RPM is:
Today's Date & Time:
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